RTG crane

An RTG crane is a rubber-tyred gantry, a self-propelled yard crane that runs on rubber wheels over fixed container lanes, spanning the stack to lift through a spreader without fixed rails. It is the standard yard crane of conventional, non-automated container terminals, stacking typically six containers wide plus a truck lane and one over five or six high. The machine steers and transfers between blocks on its own tires, so it is more flexible than a rail-mounted gantry but needs a stronger, well-drained pavement to carry its corner wheel loads of several hundred kN. Diesel-electric RTGs are widely being converted to electric busbar or cable-reel supply, and to hybrid drives, to cut fuel and emissions.